KR950011012B1 - Mehtod and apparatus for automatically establishing a color balancing of a color television monitor - Google Patents

Abstract

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Description

Color TV Devices for Monitors

1 is a schematic diagram of an example of the present invention.

2 to 5 are diagrams for explaining the first diagram.

* Explanation of symbols for main parts of the drawings

1 to 9: Signal system 11 to 19: Micom

30: Probe

The present invention relates to a color television device for monitors.

According to the present invention, a color television device for monitors used in a television station or the like, in which a white balance is adjusted by correcting a probe with respect to ambient light during automatic adjustment of a white balance. The present invention relates to an apparatus for preventing the influence of external light, etc., and also automatically setting a predetermined color balance for color images generated by color television monitors.

Color television devices for monitors used in televisions and the like require high precision in color saturation, hue, white balance, and the like. For this reason, in the related art, a skilled worker has operated by manual operation while watching the screen of a color bar on the display screen of a monitor.

However, this method has various problems. For example, a television apparatus for a monitor, which is automated by the Japanese Patent Application No. 60-77957, has been considered.

That is, in the case of adjusting the color saturation and the color, the color television signal of the EIA (Electronic Industries Association) type or the figure shown in FIG. 5B is displayed on the monitor television receiver to be subjected to the adjustment, for example, as shown in FIG. As shown, a full field type color bar signal is supplied. Therefore, in the monitor television apparatus, the three primary color signals are decoded color demodulated from the color signals. However, when the blue signal B is regarded as an example of the three primary colors signals, the color bar signal is a full field type ( 5b), the blue signal B is obtained in the periods T ₁ to T ₄ that include blue as shown in FIG. 5c.

Thus, if the color saturation is precisely adjusted, the levels of the signals B of the periods T ₁ to T ₄ of the color bars, for example white bars and blue bars, are equal to each other.

In addition, if the color is correctly adjusted, the levels of the signal B of the periods T ₁ , T ₂ , T ₃ of color bars, e.g. white bars, cyan bars and magenta bars are mutually different. same.

From there, if the level (color gain) of the carrier color signal is controlled such that the levels of the signals B in the periods T ₁ to T ₄ are equal to each other, the color saturation is precisely adjusted, and the periods T ₁ , T ₂ , T _If the phase (color hue) of the color subcarrier at the time of color demodulation is controlled so that the level of the signal B of ₃ is the same, it will be adjusted correctly in hue.

Again, the automatic adjustment of the white balance is as follows. That is, first, a constant red color is reproduced in a water tube at low luminance (for example, a signal level of 10 to 20 IRE), and at this time, the luminance of the water tube is measured by a sensor, and the measured value is prepared in advance. Compare with color temperature value. Thus, the gain and bias of the drive circuit of the receiver tube are controlled until this measured value coincides with the reference value.

Thus, the same control is then performed also for green and blue. Therefore, the white balance of a water pipe sets the color temperature corresponding to the reference value prepared previously.

However, in the case of adjusting the white balance as described above, there is external light, and this external light is superimposed on the light emission of the water tube, and this is measured by the sensor, so this measurement data is data brighter than the actual luminance of the water tube. It becomes. Therefore, when white balance is adjusted while external light is incident, an error due to external light occurs in the white balance. In particular, in the low luminance, the ratio of the incident light of the sensor to external light increases, so that the error of the white balance in the low luminance is increased.

For this reason, in reality, as shown in FIG. 4A, the sensor is housed inside a relatively large suction plate-type probe 30 to block external light. However, since external light may reach the sensor through the screen glass of the water pipe, it does not provide the high precision required for the monitor of the above type.

The sensor is, for example, a photovoltaic type photodiode or the like, but the output current of the sensor is very small at 0.5 lux at 100 lux. Therefore, it is necessary to amplify the output of the sensor with a large gain, and the offset and drift of the amplifier for the amplification become a problem.

In such a case, it is common to use the amplifier as a chopper amplifier to prevent offset or drift, but the circuit becomes complicated in such a case.

The present invention is intended to solve the above problems.

To this end, in the present invention, when adjusting the white balance, correction data of the sensor against external light is obtained, and the measurement data is corrected by the correction data.

The measurement data is corrected by the correction data, and the color saturation color and white balance are adjusted by the true measurement data.

In Fig. 1, (1) to (9) are signal systems of color video signals. Thus, in normal use, a composite color video signal is supplied from the input terminal 1 to the separation circuit 3 through the switch circuit 2, and is separated into the luminance signal Y and the carrier color signal C, and the signal Y is a matrix circuit. (4), the signal C is supplied to the color demodulation circuit 6 through the gain control amplifier 5 to demodulate the red, green, and blue color difference signals RY, GY, and BY. These signals RY to BY are supplied to the matrix circuit 4. In this way, in the matrix circuit 4, the three primary color signals R, G, and B of red, green, and blue are drawn out by the signal Y and the signals RY to (BY), and these signals R to B are obtained. Then, the luminance and contrast are supplied to the color receiving tube 9 through the adjusting circuit 7 and again through the driving circuit 8 so that the color image is reproduced in the receiving tube 9.

(1) to (19) are microcomputers for performing the above-described automatic adjustment, (11) a CPU of its 8-bit parallel processing, (12) a ROM in which programs and data for automatic adjustment are recorded. And (13) are RAMs for work and data areas, and the ROM (12) includes routines 50 shown in FIGS. 2 and 3 as routines for automatically configuring white balance. 100) is recorded. Thus, while these memories 12 and 13 are connected to the CPU 11 via the system bus 19, a keyboard 14 for inputting the mode or item for automatic adjustment and the like is provided via the port 15. It is connected to (19). The RAM 13 is formed of, for example, a C-MOS, and is backed up by the battery 16.

Again, 21 is a D / A converter, 22 is an output port, and data from the CPU 11 is converted into an analog signal by the converter 21, and the analog signal is converted into circuits 5 through ( 8 is supplied as the control signal, and the switch circuit 2 and the drive circuit 8 are controlled by the CPU 11 via the port 22. Again, 23 is a character generator, which is controlled by the CPU 11, and the character signal of the sentence indicating what the person who is controlling this monitor television device will do next. The letter signal is supplied after the separation circuit 3 through the switch circuit 2. Therefore, when adjusting this monitor television apparatus, each adjustment can be performed in an interactive form according to the instruction | indication on the screen of the water pipe 9.

Further, reference numeral 24 denotes a forming circuit which forms a video signal for adjusting the white balance, which is controlled by the output signal of the D / A converter 21, and has a high luminance (e.g., 100 IRE) video signal and a low luminance ( For example, a video signal of 10 to 20 IRE is selectively formed. Thus, this formed video signal is supplied to the circuit at the rear end via the switch circuit 2.

Again, 25 is a switch circuit, to which blue B and a signal from probe 30 described later are supplied from the adjusting circuit 7, for example, by selecting the output of the port 22. Withdraw by. Reference numeral 26 denotes a sampling and holding circuit, which samples and holds the output of the switch circuit 25, and the sampling and holding control signals are formed in the forming circuit 27 in synchronization with horizontal and vertical scanning. . Thus, 28 is an A / D converter that A / D converts the sampling and hold outputs, and the converter outputs are embedded in the CPU 11 via the bus 19.

Further, reference numeral 30 denotes a probe for forming an important part of the apparatus according to the present invention, which includes a photosensor 31 which receives light from the investigator 9, and outputs a waveform shaping amplifier 31. And the nonvolatile memory 33, the whole is sucked as shown in FIG. 4, for example. Thus, while the output of the amplifier 32 is supplied to the switch circuit 25 through the flag 34 and the jack 44, the memory 33 is the flag 34, the jack 44 and the port 43. Is connected to the bus 19 via. In this case, the memory 33 is a P-ROM, that is, an EEPROM (registered trademark) that can be electrically removed and recorded, and is used to store four sets of data of white balance, that is, data of color temperature. In addition, predetermined color temperature data is stored by the manufacturer at the first time of the set of data. In addition, data access of this memory 33 is performed continuously.

In addition, in Fig. 4, the keyboard 140 is assembled and is drawn out in this drawing, and in Fig. 4B, reference numeral 100 denotes a monitor television device having a color temperature as a reference. Saturation degree and color are adjusted by the following operation and operation.

That is, in this case, the color bar signal is supplied to the terminal 1. In addition, the probe 30 is not used. Then, the saturation and color adjustment are designated by the keys (switches) of the keyboard 14.

On the basis of the key input of the keyboard 14, the CPU 11 connects the switch circuit 2 to the contact on the character generator 23 side and simultaneously releases the character generator 23 from the CPU 11. The control signal is supplied to the character generator 23, and a predetermined character signal is extracted from the character generator 23, which is supplied to the switch circuit 2, and the color bar signal inputted to the water pipe 9 is shown in FIG. As shown in Fig. 5, a sentence asking whether it is of EIA type or a full field type as shown in Fig. 5B is displayed.

Therein, if the input color bar signal is, for example, that of the full field type (figure 5b), it is input to the kibe diagram 14.

Then, the switch circuit 2 is connected to the contact of the terminal 1 side as shown in the figure, the color bar signal of the terminal 1 is supplied to the rear end via the switch circuit 2, and the switch The circuit 25 is connected to the contact on the side of the adjusting circuit 7 as shown in the figure, and the blue signal B from the adjusting circuit 7, that is, the blue signal B of the color bar signals, is supplied to the sampling and holding circuit 26. In this case, since the color bar is of the full field type shown in FIG. 5B, the blue signal B supplied to the sampling and holding circuit 26 is obtained in each of the periods T ₁ to T ₄ as shown in FIG. 5C. Therefore, if the color saturation is accurately adjusted, the levels of the signals B of the bar periods T ₁ and T ₄ of color bars, for example, "white" and "blue" are the same. When the color is accurately adjusted, the levels of the signals B of the bar periods T ₁ , T ₂ , and T ₃ of color bars, for example, “white,” “cyan,” and “mazeter,” are the same.

First, the color saturation is adjusted. That is, in the sampling and holding circuit 26, B of the white period T ₁ of the predetermined horizontal line is sampled and held by the control signal from the forming circuit 27, and the level of this output is the A / D converter 28. ) Becomes digital data, and data showing the level of the signal B in this period T ₁ is stored in the RAM 13.

Subsequently, data similarly showing the levels of the signal B of the blue period T ₄ are stored in the RAM 13, and then data showing the levels of these periods T ₁ and T ₂ are compared and the levels are different. At this time, the gain control signal is supplied from the CPU 11 to the amplifier 5 via the D / A converter 21 so that the gain of the amplifier 5 is changed by only one step, and therefore, only one step of color saturation is changed. .

Next, again, the same data showing the level of the signal B of the blue period T ₄ is stored in the RAM 13, which is compared with the data showing the level of the first stored white period T ₁ , and the level is different. At that time, the gain of the amplifier 5 is changed by one step again.

Such an operation is performed until the level of the signal B of the period T ₁ and the level of the signal B of the period T ₄ become equal, and when both levels become equal, the color saturation is correctly adjusted. Terminate adjustment. Then, the processing of the CPU 11 includes color adjustment. In the adjustment of this color, the level of the level of the signal B of the periods T ₁ , T ₂ , T ₃ is detected, the data is stored in the RAM 13, and each level is based on the level of the period T ₁ . When the levels are different from each other, the control signal is supplied from the CPU 11 to the color demodulation circuit 6 through the D / A converter 21 to change the phase of the color subcarriers used for color demodulation by one step. Therefore, the color is changed by one step.

This operation is performed until the signal B level in the period T ₁ and the signal B level become the same in the periods T ₂ and T ₃ , and the color is correctly adjusted when both levels become equal. Terminate the adjustment.

Subsequently, in this example, the adjustment circuit 7 is provided so that the signal B level of the period T ₁ and the "black" bar period of the color bar coincides with this based on the data recorded in the ROM 12. The DC gain and AC gain are controlled so that the brightness and contrast are adjusted to the reference state.

When the color saturation, hue, luminance, and contrast are all finished, the switch circuit 2 is connected to the contact on the character generator 23 side, and the character generator 23 is controlled to control the water tube 9 ) Shows a sentence indicating that the adjustment has been completed. If this display is performed for a certain period of time, the switch circuit 2 is connected to the contact on the side of the terminal 1, and is switched to the normal mode (normal use state).

At the time when the above adjustment is completed, the RAM 13 has the final data of the level of the signal B of the period T ₁ to T ₅ and the bar period of "black" of the color bar. In other words, data remains in the RAM 13 when color saturation, color, etc. are accurately adjusted.

On the other hand, the routines 50 and 100 are executed by the CPU 11 to adjust the white balance. In other words, in this case, the probe 30 is prepared and the flag 34 is connected to the jack 44. Then, the white balance adjustment is designated by the keys of the keyboard 14.

Then, the processing of the CPU 11 starts in step 51 of the routine 50, and in the next step 52, a character signal is output from the character generator 23, and the signal is switched circuit. It is supplied to the rear end via (2), and the water pipe 9 displays a sentence asking whether the white balance is adjusted to the color temperature already stored or whether the color temperature is newly stored.

Now, if the white balance is matched with the stored color temperature, this is input from the keyboard 14.

Then, this key input is discriminated in step 53, and the process proceeds from step 53 to step 54, and the color temperature stored in this step 54 is changed to any set of the memory 33. The sentence that asks whether or not is displayed in the receiving hall (9).

Therein, if this is, for example, the first set of color temperatures (factory data), this is designated by the keyboard 14.

The process then proceeds from step 54 to step 55, in which the first set of temperature data is fetched sequentially, transferred to port 13 via port 43, and stored, Next, a window is displayed on the water pipe 9 by the output signal of the character generator 23 in step 56, and a sentence is displayed so as to adsorb the probe 30 to the window portion.

As shown in FIG. 4A, the probe 30 is attracted to the window, and this fact is input from the keyboard 14.

The process then proceeds to step 57, where the drive circuit 8 is controlled to cut off all of the signal systems of the signals R to B, and the water pipe 9 is in a non-light emitting state, and in the next step 58 The switch circuit 25 is connected in a state opposite to that shown in the drawing, and the output signal of the sensor 31 is supplied to the sampling and holding circuit 26 through the amplifier 32 and the switch circuit 25 to be at a predetermined time, that is, The predetermined display position signal of the water pipe 9 is drawn out, and this signal is digitalized by the A / D converter 28 and stored in the RAM 13. In this case, since all the signal systems are cut off in the water pipe 9, the data built into the CPU 11 shows the level of external light penetrating the sensor 31 from the outside. That is, the external light which entered the sensor 31 in this step 58 is measured.

Subsequently, the process proceeds to step 59, in which step 59 measures the reference data transferred from the memory 33 to the RAM 13 in step 55 in step 58; External light data is added. Therefore, the reference data of the RAM 13 is data that is as bright as the share of the external light amount.

Processing then proceeds to step 61 where the switch circuit 2 is connected to a contact on the forming circuit 24 side, and the forming circuit 24 uses a low luminance and video signal based on the output of the CPU 11. Is output, and this signal is supplied to the circuit at a later stage via the switch circuit (2). In addition, the CPU 11 transmits a control signal to the drive circuit 8 to cut off the signal system of the green signal G and the blue signal B. FIG. Therefore, the water pipe 9 becomes a light emission color of constant red at low brightness.

Then, in step 62, this red light is received by the port sensor 31 of the probe 30, and the amplifier 32 has a level corresponding to the amount of light emitted by the red light (this includes external light). At the same time as the signal is drawn out, the switch circuit 25 is connected to a contact opposite to that shown in the drawing, and the signal from the amplifier 32 is supplied to the sampling and holding circuit 26 through the switch circuit 25 to provide a predetermined time. That is, a signal showing the amount of light of the predetermined display position red light of the water pipe 9 is extracted, and this signal is digitalized by the A / D converter 28 and stored in the RAM 13, and the next step 63 ), The red light data of step 62 is compared with the corresponding data transferred from the memory 33 to the RAM 13 by step 55. In this case, in step 59, since the external light data is added to the reference data in step 58, even in the red light measured in step 62, the external light is included in the reference data in step 63. Compare the data with the true measurement data of the red light.

As a result of this comparison, when both data are different, the process proceeds to step 64, where the bias and gain for the red signal R of the drive circuit 8 through the D / A converter 21 in the CPU 11 are lost. Only one step is changed, and therefore, the light emission amount of the red light of the water pipe 9 is changed only by one step.

After this change, the process returns to step 62, and then the operations of steps 62 to 64 are repeated until both data to be compared become equal.

If both data become the same (intolerance), the process proceeds from step 63 to step 65, and a high brightness video signal is output from the forming circuit 24, and the steps 61 to 64 and Similarly, the bias and the gain are changed for the high luminance red signal R. In this way, the red light has light emission characteristics corresponding to the data transferred from the memory 33 to the RAM 13, and in this case, data at the time of shipment from the factory.

Subsequently, the same processing is performed on the green and blue light in steps 71 and 72 to achieve light emission characteristics corresponding to the data at the time of shipment from the factory. Therefore, the white balance is adjusted to the color temperature corresponding to the data at the time of factory shipment.

Therefore, when this adjustment is completed, the sentence indicating that the adjustment of the white balance is completed on the upper part of the water pipe 9 by the character signal in the character generator 23 in step 73 is a fixed period. It is displayed over, and then returns to the normal mode by step 74. At the end of the adjustment of the white balance, data for obtaining the white balance remains in the RAM 13.

In addition, when the data of the color temperature, that is, the color temperature of the RAM 13, is newly stored in the memory 33 in the water pipe 9, it is the memory of the color temperature for the sentence displayed by step 52. Is input by the keyboard 14.

Then, this is discriminated by step 53, and the process proceeds to step 81, and the water pipe 9 is replaced with several sets of memories 37 by the character signal from the character generator 23. Since the sentence asking whether to store the data is displayed, for example, the second set, if this is input from the keyboard 14, the sentence next prompting the adsorption of the probe 30 by step 82 and Window is displayed.

From there, the probe 30 is attracted as shown in FIG. 4A according to this display, and this fact is inputted from the keyboard 14.

Then, the process proceeds to step 83, whereby the drive circuit 8 is controlled so that the signal systems of the signals R to B are all cut off, and the water pipe 9 is in a non-luminescing state, and at the next step 84 In this case, the switch circuit 25 is connected in a state opposite to that shown in the drawing, and the output signal of the sensor 31 is supplied to the sampling and holding circuit 26 through the amplifier 32 and the switch circuit 25 to provide a predetermined time. That is, the signal of the predetermined display position of the water pipe 9 is drawn out, and this signal is digitalized by the A / D converter 28 and stored in the RAM 13. Therefore, the external light which entered the sensor 31 in this step 84 is measured.

Subsequently, the process proceeds to step 85, where a low luminance video signal is formed in the forming circuit 24, and the signal is supplied to the rear end through the switch circuit 2 and supplied to the driving circuit 8 at the same time. The signal system of green signal G and blue signal B is cut off. The water pipe 9 is a constant red light emission at low brightness.

In the next step 86, the red light is received by the probe 30, and the data indicating the amount of light of the red light (including external light) is drawn out by the converter 28 as described above. This measurement data is recorded in the RAM 13.

When the recording is completed, the video signal from the forming circuit 24 becomes a high luminance signal in the same manner as in the steps 85 and 86 in step 87, so that the water pipe 9 is at high luminance. It becomes a constant red light emission. Thus, data indicating the amount of red light is recorded in the memory 33 in the same manner.

Again, the data of low luminance and high luminance are drawn out similarly for green and blue light and recorded in the memory 33.

Therefore, when the above process is completed, the measurement data of the external light measured by step 84 in the respective color light data measured by steps 86 to 92 and stored in the RAM 13 in step 93. Are respectively subtracted into the true measurement data of each color light.

In the next step 94, this corrected data is supplied to the memory 33 through the port 43, the second set of addresses designated by the step 81 is written, and then the step ( 95, the end of the process is indicated, and then step 96 returns to the normal mode. Therefore, at this time, new data of the color temperature is recorded in the memory 33.

Further, in the case where the memory 933 stores the data of the color temperature of the other monitor television device 100 'in accordance with one aspect of the present invention, as shown in FIG. 4B, the monitor television device 100' serving as the master is shown. ) And at the same time, the signals R to B from the connector 45 are supplied to the device 100 'via the cable 110. The probe 30 is also adsorbed to the water pipe 109 of the device 100 '.

Thus, the level of the signals R to B output to the connector 45 in step 83 becomes the cutoff level (e.g., -5 IRE), and correspondingly to each of the color light emission, the device 100 ' The drive circuit is switched to emit red light, green light, and blue light. In this case, therefore, data of the color temperature of the device 100 'can be recorded in the memory 33.

In addition, as described above, data after adjustment of color saturation, color, white balance, etc. is left in the RAM 13 as it is, and this is backed up by the battery 16 even if the power supply is cut off. Then, the next time the power is turned on, the circuits 5 to 8 are set by the data left in this RAM 13, so that the color saturation, color, white balance and the like are at the time of the previous composition.

As described above, according to the monitor television device according to the present invention, color saturation, color, white balance, and the like are automatically adjusted.

In this case, in particular, according to the present invention, since the external light leaked to the sensor 31 of the probe 30 is measured, and the external light is corrected by the measurement data, the data for each color light is corrected. Regardless, accurate color light data can be obtained, and color saturation, color, coltra and white balance can be adjusted accurately.

Again, since the external light is measured and corrected immediately before measuring the color level, the offset and drift of the amplifier 32 are also considered as the external light and corrected, and therefore the amplifier 32 can be made simple. .

The routine 100 of FIG. 3 shows the details at the time of measuring external light in the steps 58 and 84.

That is, this routine 100 starts at step 101, measures external light, for example, 16 times at step 101, and then at step 102, the maximum and minimum values of the 16 measurement data are measured. The car is found, and in step 104 it is checked whether the car is within the allowable value.

When the difference obtained in step 103 is less than or equal to the allowable value, there is little variation in external light, and therefore, there is no problem even if the data of color light is corrected in the data of external light measured in step 101, and the process is determined in step 104. In step 105, the average value of the 16 measurement data is obtained, and in the next step 106, the average value is stored in the RAM 13 as the measurement data of the external light, and the routine 100 performs the step 100 in step 107. ).

In step 104, when the difference found in step 103 exceeds the allowable value, the fluctuation of the external light is large, and it is regarded as an error when the data of each color light is corrected by the data of the external light, and the processing is performed in step 104. In step 111, the character signal from the character generator 23 indicates that the white balance cannot be adjusted due to external light, and the water pipe 9 displays, for example, the process returns to step 102.

Therefore, according to this routine 100, accurate external light data can be obtained.

According to the present invention, since the external light leaking to the sensor 31 of the probe 30 is measured and the external light is corrected by the measurement data, the data for each color light is corrected. The data of color light can be obtained, and the color envelope, color, contrast and white balance can be precisely adjusted.

Again, since the external light is measured and corrected just before measuring the level of the color light, the offset and drift of the amplifier 32 are also corrected considering the external light, and therefore the amplifier 32 can be made simple. have.

Claims (1)

An apparatus for automatically setting a color balance of a color television monitor comprising a color receiving tube having a display screen provided with a television image, the apparatus comprising: adjustable driving means for driving the color receiving tube to generate a color image; Sensor means suitable for detachably attaching to said display screen and sensing external light brightness when said driving means fails to drive said color receiver, and providing external light data corresponding to said sensed external light brightness; A reference data source for displaying a reference color balance of the color image; Compensation means for compensating the reference data for the external light data; And control means for controlling the adjustable driving means in response to the compensated reference data for setting the color balance of the color image irrespective of the external light brightness.

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